How 'bout going with a PhD in Toxicology?
It's an urban legend. One of many (like Bisphenol A, fluoride...)
I could ramble on forever. But, basically it comes down to the quote by Paracelsus, the Godfather of Toxicology - to paraphrase "The dose makes the poison". The Chemist friend is correct, but almost everything is poisonous, at the right dose. There are even stories of water being poisonous to individuals who drink to much of it.
The dose isn't left on the floor. I wouldn't let my dogs eat the cloths, though.





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